Hey all.
So my extended family and I are all together getting a Nintendo DSi XL for my grandparents for Christmas. I'm looking to get them a flashcart (I personally use R4 with the Wood firmware, haven't used anything else so im not sure on other carts).

They are fairly tech savvy for grandparents so they can figure stuff out pretty quickly but i'm still going to set it all up for them.
My question is what card should I get?
I have to consider these factors:
Simplicity to get a game running.
Compatibility with games (90% will be puzzle games)
WiFi isnt an issue

It doesn't need the most features like RTS and Half Speed. All it needs to do is launch the games correctly.

So which one do you guys recommend? If I could, i would have bought them an R4 and chucked Wood on there but obviously the R4 isn't compatible with the DSi XL.

Has a easy to navigate interface. Has pretty much perfect compatibility, it takes SDHC cards. Though I'm sure their DSi XL might be updated, so you'll have to update the card yourself with your DSL. But that's easy to do

As an AK2i + DSi XL user I agree it's a great combo.
You might want to read up on the "paper trick" to solve any "contact issues" because it's more common with the XL than the others. In my experience I had the contact issues primarily due to the slight flex accidentally exerted during play because of the broadness of the DSi XL, and at first I would experience freezes all the time. I solved problem by using a small regular piece of paper as illustrated in tk_saturn's guide, but that didn't fix it permanently. After about half a year I occasionally got freezes during normal play so I had to stick a piece of scotch tape to the label side of the cart since I'm not keen on disassembling the card and i couldn't put another piece of paper in. It's working so far but I think it may bend the DSi XL contacts internally if i patch it any more times than this, so if i get contact issues again i'm probably not going to be replacing it with the same card :/

There's also the slight slide-out trick that some people have success with on the XL. When the AK2i cart is fully inserted and locked in to the DSi XL, just give the cart a slight tug with your nail so it's flush or sticking out slightly from the slot (but still locked in).
When you get akaio, themes, your games or whatever all loaded, play with it a little while to make sure it's okay. I've been royally pissed off a couple times because of freezing issues popping up unexpectedly when I had high scores or found some cool stuff and froze before I could save any of it. You may not experience the contact issues yourself but that's the primary cause of freezing with that card.

That all said, I love the AK2i and it has provided me so much more joy than frustration and I'd still recommend it so long as you know how to compensate if you get the problem I did. I'd definitely buy one again if they made the necessary improvements to the build quality with the result that no one experiences contact issues.